<template>
  <div>
      <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <!-- 这里 el-form 只能在最外面 因为 el-tabs和el-tab 要紧挨着 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
        label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item prop="goods_name" label="商品名称">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item prop="goods_price"  label="商品价格">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item prop="goods_weight" label="商品重量">
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item prop="goods_number" label="商品数量">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyData"
                     :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="s" v-for="(s,i) in item.attr_vals" 
                            :key="i" border>
                            </el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>

                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- 表示图片上传到的后台API地址 -->
                    <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" :headers="headersObj" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品按钮 -->
                    <el-button type="primary" class="bt_top" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>    
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="45%">
        <img :src="this.previewPath" alt="">
    </el-dialog>


  </div>
</template>

<script>
import _ from 'lodash'
export default {
    name:'Add',
    data() {
        return {
            // 商品分类数据列表
            cateList: [],
            // 默认激活的进度条
            activeIndex: '0',
            // 添加商品的数据对象
            addForm:{
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                attrs:[]
            },
            // 验证规则
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                    { min: 1, max: 20, message: '长度在 1 到 20 个字符', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat:[
                    { required: true, message: '请选择商品分类', trigger: 'blur' },
                ]
                
            },
            // 级联选择框配置对象
            cateProps:{
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 动态参数列表数据
            manyData:[],
            // 静态属性列表数据
            onlyData:[],
            // 图片上传组件的headers请求头对象
            headersObj:{
                Authorization: window.sessionStorage.getItem('token')
            },
            uploadURL:' http://127.0.0.1:8888/api/private/v1/upload',
            // 图片的url地址
            previewPath: '',
            // 控制图片预览框的显示与隐藏
            previewVisible: false
        }
    },
    computed:{
        cataId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            } 
            return null
        }
    },
    methods: {
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200) return this.$message.error('获取商品分类数据列表失败！')
            this.cateList = res.data
            // console.log(this.cateList);
        },
        // 级联选择器选中项发生改变会触发该函数
        handleChange(){
            // console.log(this.addForm.goods_cat);
            // 选中第三级的时候该数组的长度是  3 不是 2 这里注意
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat = []
            }
        },
        // 切换标签页是会触发该函数
        beforeTabLeave(activeName,oldActiveName){
            // console.log(activeName,oldActiveName);
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.warning('请先选择商品分类')
                return false
            }
        },
        // 点击动态参数面板时触发
        async tabClicked(){           
            if(this.activeIndex === '1'){
                const {data: res} = await this.$http.get(`categories/${this.cataId}/attributes`,{params:{sel:'many'}})
                // console.log(res);
                if(res.meta.status !== 200) return this.$message.error('动态参数数据请求失败！')
                this.$message.success('数据请求成功！')
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') :  []
                });
                this.manyData = res.data
                // this.getCateList()
            }else if(this.activeIndex === '2') {
                const {data: res} = await this.$http.get(`categories/${this.cataId}/attributes`,{params:{sel:'only'}})
                // console.log(res);
                if(res.meta.status !== 200) return this.$message.error('静态属性数据请求失败！')
                this.onlyData = res.data
                // console.log(this.onlyData);
                // this.getCateList()
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            // console.log(file);
            this.previewPath = file.response.data.url
            // console.log(this.previewPath);
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file);
            const filePath = file.response.data.tmp_path
            // 在pics 数组中 找到 要删除图片的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // console.log(i);
            this.addForm.pic.splice(i,1)

        },
        // 监听图片上传成功的钩子
        handleSuccess(res){
            // console.log(res);
            const picInfo = {pic: res.data.tmp_path}
            this.addForm.pics.push(picInfo)
        },
        add(){
            // console.log(this.addForm);
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return this.$message.error('请填写必要的表单项！')
                //执行添加商品的业务逻辑
                // 深拷贝 addForm 直接修改addform.goods_cat 会报错
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // console.log(form);
                // 发起请求添加商品 名称是唯一的 不能重复
                const {data: res} = await this.$http.post('goods',form)
                // console.log(res);
                if(res.meta.status !== 201) return thius.$message.error('添加商品失败！')
                thius.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })


            this.$message.success('添加成功')
        }          
    },


    created() {
        this.getCateList()
    },
}
</script>

<style scoped>
    .el-checkbox{
        margin: 0 10px 0 0 !important;
    }
    .el-dialog img {
        width: 100%;
    }
    .bt_top{
        margin-top: 15px;
    }
</style>